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Editing PDFs
Last updated 5/10/2016
The Horizontal Centre option aligns the selected objects horizontally through the centre of the objects, and the Vertical
Centre option aligns the selected objects vertically through the centers of the objects. The objects are aligned along a
horizontal or vertical line that represents the average of their original positions. An object can remain stationary, if it is
already aligned to the horizontal or vertical line.
Depending on the alignment option you select, objects move straight up, down, left, or right, and might overlap an
object already located there. If you see an overlap, you can undo the alignment.
1 Choose Tools > Edit PDF > Edit
2 Select the object (or objects).
3 Under Objects in the right hand panel, click Align Objects
and choose the appropriate alignment
option.
Alternatively, you can right-click the object (or objects), and point to the Align Objects option from the context
menu and then select the desired alignment option from the submenu.
Edit an image outside Acrobat
You can edit an image or graphic using another application, such as Photoshop, Illustrator, or Microsoft Paint. When
you save the image or graphic, Acrobat automatically updates the PDF with the changes. The applications that appear
in the Edit Using menu depend upon what you have installed and the type of image or graphic you have selected.
Optionally, you can specify the application you want to use.
1 Choose Tools > Edit PDF > Edit
2 Select the image or object.
Select multiple items if you want to edit them together in the same file. To edit all the images and objects on the page,
right-click the page, and choose Select All.
3 Under Objects in the right hand panel, click Edit Using
and then choose an editor.
To choose a different editor than offered on the menu, select Open With, locate the application, and click Open.
Note: If a message asks whether to convert to ICC profiles, choose Don’t Convert. If the image window displays a
checkerboard pattern when it opens, the image data could not be read.
4 Make the desired changes in the external editing application. Keep in mind the following restrictions:
• If you change the dimensions of the image, the image may not align correctly in the PDF.
• Transparency information is preserved only for masks that are specified as index values in an indexed color
space.
• If you are working in Photoshop, flatten the image.
• Image masks are not supported.
• If you change image modes while editing the image, you may lose valuable information that can be applied only
in the original mode.
5 In the editing application, choose File > Save. The object is automatically updated and displayed in the PDF when
you bring Acrobat DC to the foreground.
Note: For Photoshop, if the image is in a format supported by Photoshop 6.0 or later, your edited image is saved back
into the PDF. However, if the image is in an unsupported format, Photoshop handles the image as a generic PDF image,
and the edited image is saved to disk instead of back into the PDF.